I’m having a hard time wrapping my head around the timeline of your story. Was she “best friends” with this guy while you were together? Or are you saying that you broke up with her and then within that 4-5 months she became “best friends” with the guy and started dating him before you got back in touch with each other? To me, that seems pretty quick to establish a deliniation between when she was “best friends” with the guy to when they “started dating”. My perception would be that they developed a relationship through work which became personal and then romantic. I think hanging onto the “we were best friends first” thing is giving herself an excuse to drag this out. Especially when you say that it was commitment issues on her part that led to your breakup in the first place. Has she changed? It doesn’t seem that way based on what you’re saying. I agree with your friends – if her feelings are genuine, what’s the hold up? If she’s attached enough to the other guy whom she started dating just because she was “lonely” that she can’t let him go, I don’t understand how she could feel that strongly about you at the same time. You need to follow your own heart, but I would have a tough time trusting this woman.